SIMINSKA, Joanna, BUKOWSKA, Weronika, RATUSZEK–SADOWSKA, Dorota, NOWACKA, Krystyna and HAGNER, Wojciech. Frequency of occurrence of knock-kneed and bow-legged knees for children and young people in school age. Journal of Education, Health and Sport. Online. 20 June 2017. Vol. 7, no. 6, pp. 317-322. [Accessed 6 July 2024].